New And Precise Genetics ACTIVITY

New And Precise Genetics ACTIVITY

NAME: PCB3063 – Genetics Chromosome Aberration Worksheet

For a species with a diploid number of 18 chromosomes, indicate how many chromosomes will be present in the somatic cell nuclei of individuals that are: a. haploid b. triploid c. tetraploid

d. trisomic e. monosomic

For each of the chromosome depictions below, state what type of chromosome abnormality is shown and diagram how these chromosomes would line up during synapsis of Prophase I of meiosis. The chromosome on the left is the normal chromosome, the one on the right is one with the mutation. See slides 6, 12, 17 and 23 in the M5 Structural Chromosome Mutation lecture for examples of these structures. (They are also in your textbook.)

Type of chromosomal abnormality:

Depiction of synapsis in Prophase I of meiosis:

 

 

 

 

 

 

 

Type of chromosomal abnormality:

Depiction of synapsis in Prophase I of meiosis:

 

 

 

A B

E

D

C A

B

E

A B

E

D

C

a d

E

B

C

 

 

NAME: PCB3063 – Genetics Chromosome Aberration Worksheet

 

Type of chromosomal abnormality:

Depiction of synapsis in Prophase I of meiosis:

 

 

 

 

 

 

Using the chromosomes depicted below predict & draw what chromosomes will end up in the gametes at the end of meiosis, if there is crossing over between one set of non-homologous chromosomes between the B and C genes during Prophase I.

Depiction of synapsis in Prophase I of meiosis with crossover between B&C:

 

 

 

 

Gametes with parental & recombinant chromatids:

 

A B

E

D

C

A B

E

D

C

X Y Z

Z

X Y

A B

E

D

C

a d

E

B

C

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